This thesis deals with the modification of high-strength pultrusion profiles. The work is divided into theoretical and practical part. The theoretical part consists of four chapters, the first chapter provides definitions of composite materials, their use and their distribution. It mainly focuses on the use of composite materials for sports applications. This chapter is followed by the second chapter, which discusses the role of fiber reinforcement and matrix. Another chapter is devoted to mechanical testing of these materials, mainly tensile, compression and bending. The fourth chapter deals with pultrusion technology. The practical part of the thesis analyses the application of pultrusion technology in practice and, in particular by testing sample which was supplied by the company Willer. Samples are tested at normal and elevated temperatures with a test of 3-point flexural and impact properties. Subsequently, the results are evaluated.